Recoil properties of spallation products from bombardment of Z = 13–29 targets with 150,300 and 600 MeV protons

A semi-empirical relation developed using the classical model of high-energy nuclear reactions has been applied to spallation data obtained from thick-target — thick-collector recoil experiments. The ²⁴Na, ⁴²K, ⁴³K, ^44mSc, ⁴⁶Sc, ⁴⁷Sc ranges produced in Al, Sc, Ti, V, Fe, Co, Cu targets by 150, 300 and 600 MeV protons were determined. The excitation energies of the residual nuclei, deduced from the ranges, have been compared with theoretical calculations. The analysis shows that if the mass difference of the target and product nucleus is ΔA ? 10 the cascade plays a privileged role. If ΔA>10 an averaging effect is observed. In this case the number of prompt nucleons is about one-third of the total number and the excitation energy per evaporated nucleon is about 11 MeV.